In this tutorial, we will go through the process of transferring an ERC-20 custom token to the Polygon (Matic) chain, using the Polygon PoS SDK. We will use the Ethereum Goerli testnet and Polygon Mumbai testnet, and a custom ERC-20 token that has been deployed and had its source code verified on Etherscan. There is a step by step guide written by the author of this tutorial. The Polygon Proof of Stake (PoS) Bridge is a mechanism and set of contracts on both Ethereum and Polygon that will help us in moving assets between the root chain and child chain. In contrast with the Plasma Bridge, the Polygon PoS bridge is much faster and makes it a better option for dApps that are looking for faster withdrawals.